It can be quite normal. The fact that it is brown is ok. It's when it's actual blood and red is when it's time to worry. Some women can bleed and it be completely fine but you want to head to the doc if that is the case. But brown blood means old blood and it could just be left over from implantation or something. Keep your eye out but I would think it should subside soon.
Congrats by the way!
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